@Misc{ 
  danpet03,
  author = { Danielli, Donatella and Petrosyan, Arshak },
  title = { A minimum problem with free boundary for a degenerate quasilinear operator },
  journal = {  },
  year = { 2003 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1098/ },
  note = { cvgmt preprint}
}